JP3000415B2 - Mobile workbench - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention allows a worker to move his / her own force while riding on it, constructing and repairing building walls and ceilings, cleaning window glass, checking shelves in warehouses and archives, or The present invention relates to a mobile workbench for performing operations such as loading and unloading luggage.

[0002]

2. Description of the Related Art Wheels are arranged in front, rear, left and right of a scaffold of a frame structure, and front wheels can be moved up and down and can be steered. An operator on the scaffold can move the front wheels by themselves in an arbitrary direction by operating the front wheels. As the movable work table, a work table employing a front wheel locking system according to French Patent No. 2,592,355 has been put to practical use and is known.

[0003] This known movable workbench connects a front frame 201 and a rear frame 202 whose height can be adjusted as schematically shown in FIG. 8 and drives the height adjustable along the front frame 201. The shaft 203 is vertically movable and rotatable, and the left and right front wheels 204, 20 are provided at the lower end of the drive shaft 203.
5 is supported, and the left and right rear wheels 206, 206 are supported at the lower end of the rear frame 202. Further, the pedal 207 is mounted in the middle of the drive shaft 203, and the handle 20 is mounted on the upper end.
8 is attached.

[0004] Then, with the worker on the scaffold stand 209 releasing his / her foot from the pedal 207 and bringing the front wheels 204 and 205 into contact with the floor, the handle 208 is turned 90 degrees counterclockwise as viewed from above in FIG. Turn the left front wheel 20
5. Move the right front wheel 204 to the position
Next, by repeating the operation of turning the handle 208 clockwise by about 90 degrees to move the left front wheel 205 to the position of the right front wheel 204 as a center,
Thereafter, the left and right front wheels 204 and 205 alternately move forward, as a result, and as a result, the whole moves forward. If the left and right rotation angles of the handle 208 are made equal, the steering wheel 208 moves in a straight line, albeit slowly, and if the rotation angle to one side is reduced, it turns in that direction.

On the other hand, the lower end of the front frame 201 is
0 is formed so as to be in contact with the floor surface outside the front wheels 204 and 205, so that careless running is prevented.
And when moving by operating the handle 208,
The front legs 210 and the front wheels 204 and 205 are pressed against the floor surface with strong force.
Workers should be weighted to prevent
To the rear to support the weight mainly with the rear wheels 206, 206.
So that the front legs 210 are preferably slightly elevated
There is a need.

However, the handle 208 is alternately turned in the opposite direction.
You need to apply a considerable amount of force to move it in the direction
Therefore, it is necessary to take a forward leaning posture to some extent.
No. Therefore, you must lean forward while leaving your weight behind.
It is not possible to take an impossible posture because it is not
Great effort to move because the steering wheel is operated by force
And it is easy to cause remarkable fatigue. Especially luggage and others
Move when the load of a worker is significantly increased
It is almost impossible to do that.

[0007] Apart from this, the arm of the worker on the scaffold
Movement that is moved by leg force without force
The movable workbench is the Japanese Utility Model Application No. 48-94200 (Japanese Utility Model Application
No. 41301).
However, since this one uses leg strength,
It is easy to move, but the rear wheels are driven in front of the platform.
Therefore, the drive mechanism is large and complicated.
It is not possible to perform replacement while riding on a scaffold
Driving performance even when the height position of the scaffold is changed
For practical use, such as no consideration to prevent damage
Some incomplete parts are left.

[0008]

[Problems to be solved by the invention] The present invention seeks to solve
The problem to be solved is that the former movable workbench has an arm
Because it moves by force, it requires remarkably great effort and
Not only labor intensive, but also heavy loads and multiple workers
When the load is greatly increased due to
And the latter mobile platform
Has a large and complicated drive mechanism, forward and backward
For changing the height of the scaffolding platform
It is not possible to have a certain level of operability that corresponds
Is a point.

[0009]

To solve the above-mentioned problems, the load
It is possible to move even when the
The dynamic mechanism and steering mechanism are simple and compact
It is easy to switch between forward and reverse,
Operability changes even if the height position of the platform is changed Of
In order to have a mobile workbench, the present invention
Was.

In other words, the direction of the platform is changed from that of the work platform.
Steering mechanism to change and drive mechanism to move by leg force
For those equipped with
Front frame with lower front wheels, left and right columns and left
A rear frame with a lower right rear wheel and these two frames
And a scaffolding stand erected between the teams. Ma
In addition, the steering mechanism is vertically arranged along the front frame
Pivot shaft and handle attached to the upper end of the pivot shaft
And a drive wheel provided at the lower end.
Further, the drive mechanism is rotatably supported by the front frame.
And the vertical axis in conjunction with the rotation of the pedal
Transmission sleeve that is movable in the direction
Transmission rod that moves vertically with the
It is hung and one end is connected to the lower end of the transmission rod.
The other end is connected to the return spring and the pedal is depressed and returned.
A cable member that reciprocates by the spring force of the spring, and the cable member
Depressing the pedal in the reciprocating rotation of the winding wheel due to the reciprocating movement of the material
A one-way clutch that transmits only rotation by the
It was provided with.

[0011] Furthermore, in the above-mentioned one, two scaffolds are provided.
Can be installed at multiple heights between two frames
And place the pedal at the same height as the scaffold.
At the height of the number, it is possible to support and transmit power
Attach the sleeve at each of several height positions.
Now linked with the rotation of the dull.

[0012]

[Function] Power is transmitted when the worker on the scaffold depresses the pedal
The sleeve and transmission rod move together in the vertical direction to
Pull and rotate the winding wheel, and this rotation rotates the drive wheel.
Invert. When the pedal is released, the return spring pulls the cable member.
To rotate the ring in the opposite direction.
It is not transmitted to the drive wheels by the clutch. Also hand
Turning the wheel changes the direction of the drive wheels and turns the scaffold or
It will be retracted.

That is, a large amount of labor is required only by the leg force of the pedal.
Move a heavy scaffold without needing
Can be turned and retracted just by turning the handle
Can be performed, and the four wheels of the front wheel and the rear wheel
It is stable to support the place.

Further , the scaffold and the pedal are at the same height.
It is possible to work by changing the position up and down
As the height range increases, the maximum pedal depression
And stable driving performance can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings. In FIG. 1 showing the whole, a front frame 2 and a rear frame 11 are respectively composed of two parallel columns 3 and 4 extending in the left and right directions. , 12, 13; lower girder members 5, 14 extending in the left-right direction fixed at their lower ends with both ends protruding to both sides; and upper girder members 6, 15 extending in the left-right direction, fixed at both ends to the upper end. It is composed of two upper and lower beam members 7a, 7b, 16a, 16b extending in the left-right direction near the lower end, and two upper and lower receiving members 8, 9, 17, 18 extending in the left-right direction above them. , Front wheels 10, 10 and rear wheels 19, 19 at both ends of each lower beam member 5, 14.
Are mounted, and in particular, the front wheels 10, 10 are casters and can be freely turned. In addition, cross member 7a ...
16b, both ends of the receiving members 8 ... 18 are also fixed to the columns 3 ... 13.

Further, the front frame 2 and the rear frame 11 are detachably mounted between the front and rear columns 3, 12, 4, 13 at the lower end of the auxiliary bar member 20, and the brace 2 near the lower end.
1, are connected by a handrail 22 at the upper end. Furthermore,
A flat scaffolding base 23 having hooks 24 on the front, rear, left and right sides is installed horizontally between the front frame 2 and the rear frame 11 by hooking the hooks 24 on any of the upper and lower receiving members 8. The front frame 2 and the rear frame 11 which are connected to each other and the scaffolding stand 23 laid on the front frame 2 and the rear frame 11 constitute the scaffold 1.

A cover body 26 extending in the vertical direction is provided in front of the center of the front frame 2 so as to be detachably fixed to the upper beam member 6 and the cross members 7a and 7b. Referring mainly to FIG. 2, a turning shaft 28 formed of a pipe extending vertically in a manner penetrating the upper lid plate 26a and the lower lid plate 26b of the cover body 26 is arranged, and protrudes above the upper lid plate 26a. A handle 29 is fixed to an upper end, and a drive wheel 30 is provided at a lower end protruding below the lower lid plate 26b, and these constitute a steering mechanism 27 of the scaffold 1.

That is, the upper end of the pivot shaft 28 is the upper lid plate 26.
a, is rotatably supported by the guide tube 31 fixed to the middle lid plate 26c, and the lower end is rotatably supported by the guide tube 31. A portion extending further downward through the guide tube 31 is a lower lid plate. Holding cylinder 32 rotatably supported by 26b
And is fixed so as to rotate integrally therewith. The holding cylinder 32 has a bearing stand 33 extending downwardly fixed thereto, and a drive shaft 34 to which the drive wheel 30 is fixed is rotatably supported by the bearing stand 33.

The handle 29 and the drive wheel 30 are connected to a pivot 28
When the handle 29 is turned forward or backward, the scaffold 1 goes straight forward or backward, and the direction of the drive wheel 30 changes according to the rotation angle, so that the scaffold 1 turns. Becomes In this embodiment, the front wheel 1
Since 0 is used as a caster, the direction can be freely changed following the drive wheel 30, and turning can be easily performed.

The drive mechanism 36 for rotating the drive wheel 30 for operator riding such scaffolds 1 to the scaffold platform 23 is moved to travel under its own power is provided along the steering mechanism 27, and these one The parts are arranged concentrically and are compact
It is easy to operate.

That is, mainly with reference to FIGS. 2 and 3, the left and right side plates 26 of the cover body 26 provided on the front frame 2 will be described.
A guide groove 37 having a length equal to the interval between the upper and lower receiving members 8 and 9 for engaging the scaffolding stand 23 is formed in d, and a vertically extending guide groove 37 is formed at each of the upper and lower ends thereof. Locking grooves 37a and 37b are provided, and both ends of a support shaft 39 of the pedal 38 are fitted. In the figure, the lower receiving member 9,
18 scaffold platform 23 is bridged, although the support shaft 39 is fitted in the locking groove 37b of the lower, induce shaft 39 when erection scaffolding platform 23 above the受桟member 8,17 groove 37 To fit into the upper locking groove 37a. Thus, the scaffold stand 23 and the pedal 38 can always be placed in the same height positional relationship, and the stepped portion 38a of the pedal 38 can be stepped on with a constant maximum stepping amount without taking an unreasonable posture.

On the other hand, the transmission sleeve 40 having the flange-shaped receiving edges 40a, 40b pivots at the same vertical interval as the upper and lower receiving members 8, 9, that is, at the same vertical interval as the upper and lower locking grooves 37a, 37b. Rollers 41 are mounted on the shaft 28 so as to be movable in the vertical direction, and are attached to two arm pieces 38b extending in the opposite direction to the stepped portion 38a with the support shaft 39 of the pedal 38 interposed therebetween. , The lower receiving edge 40 in the figure
b is in contact with the lower surface. Therefore, when the height position of the scaffolding base 23 is changed, when the height position of the pedal 38 and the roller 41 come into contact with each other, the receiving edges 40a and 40b are changed. 30 rotations can be performed in the same manner, and stable operability and drive performance can be obtained.

A transmission rod 42 is inserted below the portion of the turning shaft 28 into which the transmission sleeve 40 is fitted, and a connecting piece 43 penetrates a vertically extending slot 28a formed in the turning shaft 28. Thus, the transmission sleeve 40 and the transmission rod 42 are connected.

The lower end of the transmission rod 42 protrudes into the bearing base 33, and connects one end of a rope member 44 made of a chain. The other end of the rope member 44 is connected to the top wall of the bearing stand 33 via a return spring 45 composed of a tension coil spring. The rope member 44 is a winding wheel composed of a chain wheel rotatably supported on the drive shaft 34. The wheel 46 is connected to the drive shaft 34 by a one-way clutch 47 that transmits only one-way rotation to the drive wheel 30.

These pedals 38, transmission sleeves 40,
The transmission rod 42, the rope member 44, the winding wheel 46, and the one-way clutch 47 constitute a drive mechanism 36, and the scaffold 2
When the operator who rides on the pedal 3 steps on the pedal 38, the roller 41 raises the transmission sleeve 40, and the transmission rod 42, which moves up and down integrally therewith, pulls the cable member 44 and winds the winding ring by an angle corresponding to the rising distance. Rotate 46. The rotation of the winding wheel 46 due to the pedal depression is transmitted to the drive shaft 34 and the drive wheel 30 via the one-way clutch 47, and the truck 1 moves forward. When the pedal 38 is released, the return spring 45
The rope member 44, the transmission rod 42, and the transmission sleeve 40 are pulled back by the spring force described above, but the reverse rotation of the winding wheel 46 at this time is not transmitted to the drive wheel 34.

Accordingly, by repeatedly stepping on the pedal 38, the scaffold 1 moves little by little, and when the handle 29 is turned to rotate the turning shaft 28, the transmission sleeve 40, the transmission rod 42, the holding cylinder 32, and the bearing stand 33 are integrated. And the drive wheel 30 also changes direction. The roller 41 has a flange-shaped receiving edge 40.
a, since in contact at all times to any of 40b, the pedal 3
You can freely change the direction while stepping on 8. Soshi
Thus, the worker who got on the scaffolding platform 23
And operate the handle 29 in the same posture.
In addition to turning, you can turn it 180 degrees and retreat
Driving is extremely easy and the stop position is finely adjusted
It is also easy to adjust and stop accurately at a predetermined position.

Since the bogie 1 has two front wheels 10 and two rear wheels 19 at the four corners, it is stable, and most of the load is supported by them, so that the drive wheels 30 are exclusively used for movement. Only works. However, when the pedal 38 is depressed, a force in the lifting direction is generated in the drive mechanism 36, and the frictional moment of the drive wheel 30 is reduced, and there is a concern that the drive wheel 30 may run idle. Therefore, in this embodiment, the spring support 32 provided at the upper end of the holding cylinder 32 is provided.
A weighting mechanism 49 having a configuration in which a pressing spring 50 made of a compression coil spring surrounding the guide cylinder 31 is provided between the a and the inner lid plate 26c, and the driving wheel 30 is appropriately mounted on the turning shaft 28 and the bearing stand 33. A downward force for contacting the floor surface with pressure was applied. By this weighting mechanism 49, the driving wheel 30 can surely move the scaffold 1 without idling.

Next, when performing work with the scaffold 1 stopped,
The scaffold 1 is supported by four wheels 10 , 19 arranged in front, rear, left and right, and is stable. However, the scaffold 1 moves depending on the posture of the worker on the scaffold 23 and the direction of the force applied to the foot during the work. Since there is a concern , a scaffold stationary mechanism 52 is provided in this embodiment as a countermeasure.

That is, referring mainly to FIGS. 2 and 4, the lifting rod 53 is inserted into the left and right columns 3 and 4 of the front frame 2, and the lower end thereof projects below the columns 3 and 4. A shoe member 54 made of an elastic material such as rubber or synthetic resin is mounted.

The lifting rod 53 is applied with a lifting force for separating the shoe member 54 from the floor surface by a lifting spring 55 composed of a compression coil spring fitted between a spring receiver 53a provided near the lower end and the lower girder member 5. And a push rod 56 in the form of a round bar near the upper end.
7 protrudes. Further, a release lever 58 is provided slightly above the press lever 56, and its bent tip 5
8a is fitted on the lifting rod 53,
A lock spring 61 made of a compression coil spring is inserted between the receiving seat 60 which is installed in the inside and through which the elevating rod 53 penetrates, and the bent front end portion 58a. Then, the bending tip 58 a is pressed by the spring force of the lock spring 61, and the tip of the bending tip 58 a contacts the locking edge 60 a of the receiving seat 60.
8a is inclined with respect to the axis of the lifting rod 53,
It is bitten by the lifting rod 53.

The release lever 58 is attached to the handrail 2 from the supports 3 and 4.
2, a handle 58 b at the base end protrudes above the handrail 22. Press down on the handle 58b and release the lever 5
8 is rotated about the contact point with the locking edge 60a to make the bent tip 58a perpendicular to the axis of the elevating rod 53 to form a gap between them. In this state, the push-down lever 56 is pressed down by overcoming the spring force of the lifting spring 55, thereby lowering the lifting / lowering rod 53 and pressing the shoe member 54 against the floor surface,
Release the release lever 58. As a result, the lifting rod 53
The bent tip portion 58a is bitten and fixed at the lowered position, and the shoe member 54 is in pressure contact with the floor surface, thereby preventing the movement of the front wheel 10 composed of casters, and eliminating runaway during stoppage. Also, the handle 58b of the release lever 58
Is depressed, the lifting rod 53 is raised by the spring force of the lifting spring 55, and the shoe member 54 is separated from the floor surface.

The lifting rod 53, the shoe member 54, the lifting spring 55, the release lever 58, the locking edge 60a, the lock spring 6
Reference numeral 1 denotes a scaffold stationary mechanism 52.

As is clear from the above description, the present embodiment
According to the above description, the worker on the scaffolding base 23 repeatedly steps on the pedal 38 and operates the handle 29 to move the scaffold 1 stably in an arbitrary direction without requiring a large amount of labor, and further workable height. The benefits of a wider range
Do not worry about runaway by fixing scaffold 1
Ku has the advantage to perform the work at a predetermined position, but the three mechanisms described below to further enhance the mobility of scaffold 1 in addition to these added supplementarily in the present embodiment.

That is, first, a front wheel floating mechanism 63 is provided which pushes the drive wheel 30 down to a fixed position with respect to the front wheel 10 so as to improve mobility on an upward slope.

Referring to FIGS. 2 and 5, the front wheel levitation mechanism 63 has a bearing base 65 fixed to a mounting base 64 fixedly installed at a high position inside the cover body 26 of the front frame 2. An operating lever 66 having a handle 67 is
The bearing base 65 is rotatably supported by the
A pressing shaft 70 is slidably supported through a guide sleeve 69 provided on the pivot shaft 28. The pressing shaft 70 has a plate-like shape having a bifurcated portion at its tip for contacting engagement with a flange-like receiving edge 71 provided on the pivot shaft 28. The pressing part 72 is fixedly attached to one end, and the other end is rotatably connected to the operating lever 66 by a link 73.

The pressing shaft 70 is arranged in parallel with the turning shaft 28, and the pressing piece 72 is located slightly above the receiving edge 71. The worker riding on the scaffold stand 23
When the operator inserts his / her hand from behind and pulls while turning the handle 67 downward, the operating lever 66 rotates clockwise around the pin 68, thereby pulling the pressing shaft 70 downward and pressing the pressing piece 72. By pushing the receiving edge 71, the turning shaft 28, the holding cylinder 32, and the bearing stand 33 are integrally lowered. As a result, the drive wheel 30 is pushed down to a fixed position a little more than the front wheel 10, the scaffold 1 is supported by the three-point support of the rear wheel 19 and the drive wheel 30, and the front wheel 10 slightly rises from the floor.

[0037] The pressing piece 72 is pulled to the position of the handle 67 by a two-dot chain line 67a in FIG. 5 in the present embodiment codes 7
The operation lever 6 is moved down to the position indicated by 2a.
Since the link 6 rotates beyond the dead center by pulling the link 73, the upward movement of the turning shaft 28 is prevented by the reaction force of the load supported by the drive wheel 30.

By relatively floating the front wheel 10 in this manner, the movement from the horizontal floor surface to the upwardly inclined floor surface is smooth, and the front wheels 10 are floated on the inclined surface where the direction tends to be unstable because of the casters. It can be stably moved in the direction. The pressing portion 72 moves upward by pulling while turning the handle 67 in the opposite direction, and the turning shaft 28 and the driving mechanism 36 return to the predetermined height position.

As a second mechanism for improving the mobility of the scaffold 1, there is provided a rear wheel braking mechanism 75 for applying a braking force to the rear wheel 19 to improve stability and safety on a downward slope. ing.

Referring to FIG. 6, this rear wheel braking mechanism 75
A brake lever 77 is rotatably supported by a pin 78 on a handle receiving seat 76 fixedly installed on the upper surface of the handrail 22, and a wire 79 having one end connected to the brake bar 77 is connected to the handrail 22 and a support of the rear frame 11. 12, 13,
A wire 7 is attached to a shoe holding member 82 which is disposed along the lower girder member 14 and is rotatably supported by a pin 81 inside a cover box 80 fixed and installed on the upper surface of the lower girder member 14.
9 is connected to the other end of the rear wheel 1.
9 and a release spring 84 comprising a tension coil spring.
Is constructed between the cover box 80 and the shoe holding member 82.

The brake lever 77 is parallel to the handrail 22 when the brake is not applied. When the brake lever 77 is rotated clockwise about the pin 78, the wire 79 is pulled to push the shoe holding member 82 against the spring force of the release spring 84. Wins and turns, Shu 83
Is pressed against the ring surface 85 to apply a braking force to the rear wheel 19.

By braking the rear wheel 19 in this manner, acceleration can be limited when moving on a floor surface inclined downward, and the vehicle can be safely moved without fear of a collision or a fall due to runaway.

As a third mechanism for improving the mobility of the scaffold, there is provided a drive wheel floating mechanism 86 which lifts the drive wheel 30 to a position higher than the front wheel 10 and facilitates movement by manual pushing outside the work site. Have been.

The drive wheel floating mechanism 86 is a front wheel floating mechanism 6
3 performs the opposite operation up and down and has the same configuration. That is, referring to FIGS. 2 and 7, a bearing base 88 is fixed to a mounting base 87 fixed and installed at a low position inside the cover body 26, and an operating lever 89 having a handle 90 is fixed to the bearing base 88 by a pin 91. The guide shaft 92 is rotatably supported and has a pressing shaft 93 on a guide sleeve 92 provided on a bearing base 88.
Are slidably supported through, and the pressing shaft 93 is
2, a plate-shaped pressing portion 95 having a bifurcated portion at the tip thereof for contacting engagement with a flange-shaped receiving edge 94 provided at one end is fixed to one end, and the other end is connected to an operating lever 89 by a link 96. In this configuration, they are rotatably connected to each other.

The pressing shaft 93 is arranged parallel to the holding cylinder 32, and the pressing piece 95 is located slightly below the receiving edge 94. When the worker standing on the floor inserts his hand from behind into the cover body 26 and pulls while turning the handle 90 upward, the operating lever 89 rotates counterclockwise around the pin 91 in the drawing, whereby The pressing shaft 93 is pulled upward, and the pressing piece 95 raises the receiving edge 94 to raise the holding cylinder 32, the bearing stand 33, and the turning shaft 28 integrally. As a result, the drive wheel 30 is lifted to a higher position than the front wheel 10,
The scaffold 1 is supported by four-point support of the front wheel 10 and the rear wheel 19.

[0046] The pressing piece 95 is pulled also to the position of the handle 90 in the illustrated two-dot chain line 90a in this embodiment is intended to be above <br/> rise, the actuating lever 89 is a dead point by pulling on the links 96 Since the pivot shaft 28 is rotated over, the movement of the turning shaft 28 and the drive mechanism 36 falling by its own weight is prevented.

By lifting the drive wheel 30 in this manner, when the operator moves the floor by hand pushing on the floor without getting on the scaffolding base 23, the drive wheel 30 that is free to turn is connected to the two front wheels 10 that are also free to turn. The inconvenience of making it impossible to move in different directions is eliminated, and it is possible to easily and reliably carry in and carry out the work site. The pressing portion 95 moves downward by pulling the handle 90 while turning it in the opposite direction, and the turning shaft 28 and the driving mechanism 36 return to the predetermined height position.

In the illustrated embodiment, the steering mechanism 27 and the drive mechanism 36 are provided on the cover 26 which is detachable from the front frame 2, so that the assembly, adjustment, inspection and repair of the scaffold 1 are performed.
There is an advantage that it can be performed at any place by separating from the. For this purpose, a latching mechanism (not shown) for holding the pedal 38 upright and storing it in the cover body 26 may be provided. Further, means for detachably fixing the cover body 26 to the front frame 2 may also be provided by screws, A known device such as a latch can be appropriately used.
May be directly mounted on the front frame 2 and not covered with the cover body 26.

[0049]

As is evident from the above description, an operator riding on a scaffold supported by four front and rear wheels rotates the drive wheels by repeatedly pressing the pedals, and operates the handle by operating the steering wheel. Because the wheels are turned by changing the direction of the drive wheels, they must be able to move stably in any direction without requiring a large amount of labor even under heavy loads with large scaffolds and cargo or two or more workers. This makes it possible to carry out work at high altitudes little by little without causing significant fatigue. Moreover, the steering mechanism and drive
Combine the structure with a compact structure with a part arranged concentrically
Therefore, the whole structure becomes simple and driving is easy.
It will be.

Further, by changing the height of the scaffolding base, the workable height range is widened, so that not only can it be used for a wide range of applications, but also the position of the pedal can be changed correspondingly.
A stable driving performance can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is an enlarged longitudinal sectional partial view of FIG.

FIG. 3 is a partial longitudinal sectional view mainly showing a driving mechanism.

FIG. 4 is a partial longitudinal sectional view showing a scaffold stationary mechanism.

FIG. 5 is a partially cutaway side view showing the front wheel levitation mechanism.

FIG. 6 is a partially cutaway layout view showing a rear wheel braking mechanism.

FIG. 7 is a partially cutaway side view showing the drive wheel floating mechanism.

FIG. 8 is a schematic perspective view of a conventional example.

[Explanation of symbols]

1 scaffold, 2 front frame, 3,4,12,13 strut, 10 front wheel, 11 rear frame, 19 rear wheel, 23
Scaffolding stand, 27 steering mechanism, 28 turning axis, 29 handle, 30 drive axis, 36 drive mechanism, 38 pedal, 4
0 transmission sleeve, 42 transmission rod, 44 cable member,
45 return spring, 46 winding wheel, 47 one-way clutch,

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 1/24 B62B 3/00 E04G 1/22 E04G 1/36

Claims (2)

(57) [Claims] 1. It has left and right columns and front left and right lower wheels.
With a front frame, left and right supports, and rear wheels on the lower left and right.
To be installed between the rear frame and the two frames.
A scaffold with a scaffolding stand, and vertically arranged along the front frameHollow swivel axis
And the saidPivot axisHandle mounted on top of and below
A steering mechanism having a drive wheel mounted on an end, a pedal rotatably supported by the front frame,Said
Fitted on a pivot axis and can be moved vertically in conjunction with the rotation of the pedal
A power transmission sleeve, and the power transmission sleeve inserted into the pivot shaft.
A transmission rod that moves vertically with the leave and a wrapping ring
And one end is connected to the lower end of the transmission rod.
And the other end is connected to a return spring,
A cable that reciprocates by stepping on and the spring force of the return spring
Member and reciprocating rotation of the winding wheel by reciprocating movement of the cable member
Only the rotation by depressing the pedal in the rotation is the drive
A drive mechanism with a one-way clutch transmitting to the wheels, A mobile workbench comprising: 2. The mobile workbench according to claim 1,
The scaffolding platform has a plurality of height positions between the two frames.
The pedal can be replaced and installed, and the pedal and the scaffold stand
Change to multiple height positions placed at the same height position
The transmission sleeve is
Rotation of the pedal at each of the plurality of height positions
A mobile workbench, characterized in that it is adapted to be linked to the worktable.